HCA HealthONE | 35,899 followers on LinkedIn. HCA HealthONE - a part of HCA Healthcare - is the leading healthcare provider in Denver. | As part of HCA Healthcare, we at HCA HealthONE serve the metro Denver area as the largest healthcare system, with more than 11,000 employees. Our hospitals work together to provide a higher level of care. In addition, our network includes freestanding emergency departments and numerous ambulatory surgery centers, CareNow urgent care centers and occupational medicine clinics, physician practices, medical imaging centers and AirLife Denver, which provides critical care air and ground transportation serving Colorado and surrounding states.